Methods and devices for routing data packets between IPv4 and IPv6 networks
A data grouping and routing technology, applied in the field of telecommunication networks, can solve problems such as expensive applications and achieve the effect of less complex operations
Active Publication Date: 2012-09-26
宇东集团有限公司
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[0081] Thus, the "DS-lite-interco" solution simplifies packet routing compared to the "DS-lite" solution, but the application of NAT / NAPT functions in this network also remains to occur from time to time, in particular When terminal T-A located in the private network associated with gateway CPE-A (itself connected to node DS-lite-A) and T-B located in the private network associated with gateway CPE-B (itself connected to node DS -lite-B) when communicating, because in this case, two DS-lite devices realize the expensive application of NAT / NAPT function
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[0136] Figure 4 A data packet routing system in an embodiment of the invention is shown. In this figure, terminals T1 and T2 belong to a private IPv4 network, and each of them is connected to a corresponding CPE gateway with its own IPv6 prefix.
[0137] In an IPv6 network, each CPE gateway is connected to a network access router (RAR). The prefixes of the CPE gateways connected to the same router are under a common prefix called "network access router level prefix": this is the traditional IPv6 routing principle, where a "trunk" (here network access router) is assigned The shorter prefixes of the network contain (encompass) the longer prefixes assigned to the "leaves" (here CPE gateways); for example, if a network access router advertises that it can route 43-bit prefixes (this is the "network access router level ”), this gives it the potential to serve 8192 CPE gateways, since each gateway has a 56-bit prefix (where, 56-43=13 and 2 13 =8192).
[0138] Traditionally, suc...
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The invention relates to a system for routing data packets, wherein: at least one terminal (T1, T2) belonging to a private IPv4 network is linked to a gateway (CPE), said gateway which is, in turn, linked to an IPv6 network; and at least one interface device (DS-INT), located on the interface between said IPv6 network and at least one public IPv4 network, can implement a translation function (NAT) that involves replacing a private IPv4 address with a public IPv4 address. According to the invention, said gateway (CPE) can attribute an IPv6 address, which is formed by combining an IPv6 prefix with the private IPv4 address of the terminal in the private IPv4 network thereof, to the terminal (T1, T2). Said gateway (CPE) can also check whether there is an IPv4 address conflict and, in the event of an IPv4 address conflict, locally replace said private IPv4 address with a substitute private IPv4 address. The invention is applicable to the routing of an IPv4 data packet sent by a source terminal belonging to a first IPv4 domain, to a receiving terminal belonging to a second IPv4 domain, via an IPv6 domain.
Description
technical field [0001] The field of the invention is that of telecommunication networks, in particular Internet Protocol (IP) telecommunication networks in which data packets are transmitted from a source device identified by a source address to a destination device identified by a destination address. Background technique [0002] Such a telecommunication network groups together a plurality of devices, a plurality of links, and a plurality of functions dedicated to the transmission of data sent by terminals connected to said network. Specifically, the transport function can be realized by activating the routing and transport protocol. In the following, a telecommunications network managed by an operator is also referred to as a domain. [0003] IP networks include devices known as "routers" and used to route data packets to their destination based on the destination address revealed by each packet received by the router. To this end, the router uses a "routing table" cons...
Claims
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Login to View More IPC IPC(8): H04L12/56H04L29/12H04L45/52
CPCH04L29/12367H04L45/52H04L61/251H04L29/12358H04L61/2514H04L45/00
Inventor M.卡西拉鲁J-L.格里莫尔特
Owner 宇东集团有限公司